Locking ring



FIG. 1 is a front, top, right perspective view of a locking ring according to the invention;

FIG. 2 is a front plan view according to the invention; and,

FIG. 3 is a back plan view according to the invention; and,

FIG. 4 is a top elevational view according to the invention with the bottom being a mirror image thereof; and

FIG. 5 is right side elevational view according to the invention, with the left side being a mirror image thereof; and,

FIG. 6 is a back, bottom, right perspective view according to the invention. 

CLAIM The ornamental design for a locking ring, as shown and described. 